| 학회 |
한국고분자학회 |
| 학술대회 |
2007년 봄 (04/12 ~ 04/13, 제주 ICC) |
| 권호 |
32권 1호 |
| 발표분야 |
고분자 구조 및 물성 |
| 제목 |
Effect of aging time on physical aging of thin glassy 6FDA-based polyimde film. |
| 초록 |
The effect of molecular structure modifications on the kinetics of physical aging of thin films formed from 6FDA-based polyimides was investigated by tracking the changes in gas permeability and refractive index with time. The permeability for 6FDA-based polyimde thin films containing carboxyl acid groups commonly decreased 20%~50% after the isothermal aging and the selectivity gained anywhere from 10% to 30% while the rate of permeability loss on the change of polymer structure showed different reciprocal ralationship between 6FDA-6FpDA based polyimides and 6FDA-DAM based polyimides. The rate of permeability loss and densification were determined by using refractive index change. The volumetric aging rate was shown to be highly dependent on the change of molecular structure (carboxyl acid groups). Based on the change of volumetric information on the change of aging time, the change of fractional free volume for 6FDA-based polyimide containing carboxyl acid group were evaluated. |
| 저자 |
임현구, 김주헌
|
| 소속 |
중앙대 |
| 키워드 |
physical aging; thin film; fluoropolyimide
|
| E-Mail |
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